Making plans for a convention coming up in June.
My two year old daughter needs a couple of costumes, and I'm open to ideas. I don't really watch much anime, so I would love to hear suggestions from sci-fi/video games/pop culture/comics etc.
She's too young for wigs, but she does hats and makeup pretty well.

What a cutie!!! I don't know if this is along the lines of what you have in mind....but my son has recently outgrown some of his costumes. I would love to find them a good home! Here are the ones that I think could work for girls or boys:

Reality: Recycled or no cosplay at all. Got to love commissioning! Thanks everyone!! Serious thanks to Dulcinea, who actually made the deadline for the accessories far in advance and of outstanding quality. Sucks they won't be used.

She does have pink hair.. but you may be able to spray dye your daughter's hair ( Really it's frowned on in the cosplay community, but I don't think anyone will mind a toddler does it..) Or you could maybe sew in pink wefts to the hat she wears.

I read the title before I clicked on this thread and thought Chibi Chibi from Sailor Moon Sailor Stars :-)). Its very rare to see a chibi chibi cosplay because it wouldn't work unless the child was very young or very small. I think she would suit her quite well.
In her regular form
Sailor Form

For her hair you could curly it then put it in bunches and put some heart clips at the top of the bunches, you could colour her hair but cause she is only little it wouldn't look like you're being lazy or anything like that :-))

She will be a little hit with anyone who has seen the show and I bet she will feel like a little princess, I would xDDD